image.onError event never fires, but image isn't valid data - need a work around

Question

I am trying to append an image to a page using JavaScript:

image = document.createElement(\'img\');
image.onload = function(){
    document.body.appendChild(         


        

Answer 1

In the image.onload event listener, check whether image.width and image.height are both zero (preferably image.naturalWidth and image.naturalHeight, when they are supported).

If the width and height are both zero, the image is considered invalid.

Demo: http://jsfiddle.net/RbNeG/

// Usage:
loadImage('notexist.png');

function loadImage(src) {
    var image = new Image;
    image.onload = function() {
        if ('naturalHeight' in this) {
            if (this.naturalHeight + this.naturalWidth === 0) {
                this.onerror();
                return;
            }
        } else if (this.width + this.height == 0) {
            this.onerror();
            return;
        }
        // At this point, there's no error.
        document.body.appendChild(image);
    };
    image.onerror = function() {
        //display error
        document.body.appendChild(
            document.createTextNode('\nError loading as image: ' + this.src)
        );
    };
    image.src = src;
}